Move AES128 above AES256 by default.
This is in preparation for adding AES_256_GCM in Chromium below AES_128_GCM.
For now, AES_128_GCM is preferable over AES_256_GCM for performance reasons.
While I'm here, swap the order of 3DES and RC4. Chromium has already disabled
RC4, but the default order should probably reflect that until we can delete it
altogether.
BUG=591516
Change-Id: I1b4df0c0b7897930be726fb8321cee59b5d93a6d
Reviewed-on: https://boringssl-review.googlesource.com/7296
Reviewed-by: Adam Langley <agl@google.com>